I don't think it's so much a mistake as a disagreement with the process of extradition. Government wants person so they can abridge their freedom from across the globe to satisfy the government's belief that they have the right person.
It's understood the trial ultimately determines the person's fate but it does seem like more proof or evidence should be made public before taking a rather rather drastic action like this. They don't have to show their whole hand, but something that is convincing enough that they have the right guy.
Again completely Realize that's not how extradition works it's just it does seem like a raw deal that flies in the face of the U.S. Justice system ideals